Refrigerating apparatus



5 Sheets-Sheet 1 Filed Feb. 14, 1930 Www! X mis July'l?, 1934. c. E. l..LIPMAN REFRIGERATING APPAHTUS Filed Feb. 14, 1930 5 Sheets-Sheet 2,Im/@Mar Carl f.' L.

July 17, 1934. C, E, L, UPMAN Y 1,967,033

REFRIGERATING APPARATUS med Feb. A14, 1930 5 sheets-sheet 5 July 17,1934. c. E. l.. LIPMAN 1,957,033

REFRIGEBATING APPARATUS l tiledreb. 14, 1930 5 sheets-sheet 4 l//l//ljnvenzbr: Y CarZ N@ )0l/@uw hlx/6MM *MW July 17, 1934.

3c. E. l.. LIPMAN REFRIGERATING APPARATUS md Feb. 14. 1930 5Sheets-Sheet 5 Q um I lf

Patented July 11, 1934 PATENT OFFICE aEFmGEaAmG APPARATUS Carl E. L.Lipman, Chicago, Ill., assigner to Lipman Patents Corporation, Chicago,Ill., a corporation of Delaware Application February 14, 1930, serialNo. 428.21mv

zo claims. (Cl. ser-115) manifest that many of the principles and fea-vtures of my invention are capable of embodiment in apparatus suitablefor purposes other than that of refrigeration.

One of the purposes of' my invention is to provide a unit embodying amotor, a compressor or vacuum pump, an oil pump, and drivingconnections, all combined and arranged in a novel and compact assemblywhich will occupy a minimum of space, which will be highly eiilcient inoperation, which will be durable in use, and which can be economicallymanufactured and assembled.

Another object of my invention is to prevent overheating of the motorand the compressor by absorbing in a cooling fluid the heat generatedvby` these elements when in use andfcirculating this cooling uid in sucha manner as, for example, through a heat dissipating device such as aradiator or coil by which the absorbed heat is dissipated to theatmosphere.

Another object of my invention is to prevent overheating of the motorand yet to provide means for maintaining the compressor at asubstantially uniform temperature during both running and idle periodsby absorbing in the cooling fluid only a portion of the heat generatedby the elements-of the unit. By this means the absorption of anysubstantial amounts of gas in the cooling medium is prevented.

Another advantageous feature of my invention contributing towardcompactness and emciency of the unit resides lin the manner of mounting,supporting, andconnecting the motor and pump or compressor, so thatwhile concentrically mounted to occupy a minimum of space, the weight ofneither is carried by the other and no lateral pull of the motoroccasioned by any inequalities or imperfections in the rotor or statoror in the mounting thereof is transmitted to the pum'por its shaft.

A further object is to provide a combined oil pump and gas compressor inwhich the.same moving parts serve the dual function of pumping andcirculating the cooling fluid and simultaneously inducing a partialvacuum in the suction side of the compressor and compressing anddelivering under pressure the gas drawn into the compressor from saidsuction side.

Another object isto provide an apparatus in which all of the movingparts will be insured adequate lubrication by the positive force feeddelivery of lubricant thereto, thus promoting longevity of theapparatus.

Still another object is to insure against lea'kage or slippage of thegas within the compressor by providing an oil seal for the compressorblades, each seal being automatically replenished at each actuation of ablade.

A further feature resides in the fact that my invention contemplates theelimination of pounding or hammering in the oil pump by admitting withthe oil on each suction stroke a small quantity of compressible gas, thecompression of which eliminates knocking in the pump and contributestoward the efficiency and life of the apparatus.

Still another object is to provide an oil distributing device which notonly insures the distribution of theoil over the motor for coolingpurposes, but also tends toward the separation of the entrained gas fromthe delivered oil.

' Other objects and many of the inherent advany tages of my inventionwill be appreciated as the same becomes better understood from anexamination of the specication and claims in connection with theaccompanying drawings, wherein:

Fig. 1 is a vertical sectional view through a unitv embodying myinvention;

Fig. 2 is a bottom plan view;

Fig. 3 is a horizontal sectional view on line 3-3 of Fig. 1;

Fig. 4 is a similar view on the line 4-4 of Fig. 1;

Figf 5 is a sectional view on the line 5--5 oi Fig. 1;

Fig. 6 is a sectional view on the line 6-6 of Fig. 1 the stator windingsbeing omitted;

Fig.. '7 is a sectional view on the line '7--7 of Fig. 6;

Fig. 8 is a fragmentary section on the line 8--8 of Fig. 6;

Fig. 8a is a fragmentary section on the line 8a of Fig. 6;

Fig. 9 is a side elevation of the pump rotor and shaft;

Fig. 10 is a sectional view on the line 10--10 of. Fig. 9;

Fig. 11 is a sectional view on the line 11--11 of Fig. 10;

Fig. 12 is an elevation of the hollow bearing standard; v

Fig. 13 is a sectional view on the line 13-13 of Fig. 12;

Fig. 14 is a detailed side elevation of the pump housing; and

Fig. 15 is a schematic view of the unit and the parts associatedtherewith.

Referring now to the drawings more in detail and particularly to thediagrammatic layout shown in Fig. 15, reference character 16 indicatesgenerally the hermetically sealed unit in which the operating parts ofmy apparatus, to be later described, are disposed; 17 is the condenserof the refrigerating sysm to which compressed refrigerating medium isdelivered through a pipe l8 communicating with the interior of the unitcase near the top thereof; 19 indicates an expansion valve of anypreferred construction, and 21 the evaporator or expansion coil of thesystem from which the refrigerant is withdrawn through the pipe 22 intothe suction side of the compressor, as will be later explained. Itshould be understood that while I have illustrated a conventionalexpansion valve and expansion coil 21, the valve may be eliminated andanother type of evaporator or expander employed if the system isoperated on the flooded system principle.

23 indicates the oil cooling element which may be in the .form of acoil, radiator, or other preferred form of heat dissipating device, thiselement being connected with the oil sump of the unit by a pipe 24 andwith the suction side of the Dump by a pipe 25.

The unit itself, disclosed more in detail in the remaining figures ofthe drawings, comprises a base 26 adapted to be supported upon feet 27preferably formed of rubber or other vibration absorbing material, thebase being shaped to provide a central oil well 28 formed in a table 29rising centrally from the bottom of the base and surrounded by adepressed portion forming an oil sump 31.

A pump housing is supported upon the table, the housing comprising adisc or base plate 32 forming the bottom of the housing, an annularmember 33 forming the side walls of the housing, and provided with acentral bore 34 forming the rotor chamber and a top plate 35 which alsoconstitutes the base of a tubular standard 36 rising from this base.Upon the base 35 an annular spider 37 is supported, the webs 38 of thespider carrying at their outer ends a ring 39 equipped with a pluralityof upstanding posts 41 upon which the stator 42 of the electric motor issupported. The parts 29, 32, 33, 35 and 37 are all rigidly fastenedtogether when assembled by a plurality of screw bolts 43 illustrated inFigs. 1 and 6, and the base plate 32 and top plate 35 independentlysecured to the housing member 33 by screw bolts 44 and 45 respectively.The stator of the motor is securely attached to its supporting posts 4lby a plurality of bolts or rods 46.

The standard 36 serves as the journal bearing for both the rotor of theelectric motor and the shaft of the pump and compressor so that therotor and compressor pump are coaxially disposed and connected by adirect driving connection which however, as will be later explained, isso constructed that no weight or lateral thrusts of the rotor will betransmitted to the pump shaft. From Fig. 1 it will be observed that arotor sleeve 47 carrying the rotor structure 48 surrounds and isjournaled upon the periphery of the standard 36, the weight of thesleeve and supported parts of the rotor however being supported by thelower end of the sleeve upon the standard base 35. The shaft 49 for thepump and compressor which is formed integrally with the pump andcompressor rotor 51, as will be apparent from Figs. 9 and 10, isjournaled within the standard 36 conccntriclly with the sleeve 47, andthe weight of the rotor and shaft rests upon the base plate 32 of thepump and compressor housing. The upper portion of the shaft 49 above thestandard 36 is provided with a square shoulder 52 to receive the squaredopening in a driving member 53 which includes radially projecting arms54, each seated in a correspondingly shaped slot 55 formed in the upperend of the sleeve 47. It will be apparent that this member forms adirect driving connection between the rotor sleeve 47 and the shaft 49,but that because of the slidable relation between the member 53 and thesleeve, no lateral movements or thrusts of the sleeve can be transmittedto the shaft. This feature is of considerable practical importancebecause any lateral movements or thrusts of the rotor due toimperfections in the motor or side pull exerted by the stator upon therotor, if transmitted to the pump rotor shaft, would inducemisalignment, chattering, and wear, all detrimental to the efficiency,operation, and life of the apparatus. 'I'he rotor 51 of the pump andcompressor is ldisposed eccentrically within the bore 34 of the'housing, as will be apparent from Fig. 6, and this rotor is providedwith a plurality of radially disv posed blade receiving sockets 56 forthe reception of reciprocatory blades 57 adapted to reciprocate radiallyin said slots. While I have shown for purposes of illustration a rotorprovided with two oppositely disposed slots and blades, it should beunderstood that a greater number may be employed if preferred withoutaffecting the principles of my invention. l

The blades are maintained at all times a predetermined distance apart byan abutment pin 58 extending transversely of the rotor between theblades, the pin being equipped with enlarged bearing surfaces 59slidably fitting within a transverse guiding bore 60 formed in therotor.

The length of the abutment pin is such that the outer ends of the bladeswill always be maintained in contact with the surrounding walls of therotor housing, and as one blade is forced inwardly during the revolutionof the rotor, due to the eccentric relation between the rotor andhousing, the companion blade will be correspondingly through the pinforced outwardly into contact with the opposite wall of the housing,with the result that sliding contact between the ends of the blades andthe surrounding housing is maintained at all times and without theemployment of springs or other yielding devices liable to get out oforder and impair the operation of the apparatus.

'I'he outer end of each blade is provided with a concavity extendingfrom top to bottom thereof in, which is disposed a sealing element 6ladapted to form the contact with the surrounding walls of the bore.'I'hese sealing elements are made of hardened steel or-other wearresisting material and their outer bearing surfaces are formed on an archaving a radius equal to the radius of the housing bore. Each element isshaped to nt its concave socket so that it is free to oscillate thereinupon rotation of the rotor, thereby enabling the sealing elements toautomatically conform to the curvature of the surrounding walls andmaintainv a surface-to-surface contact therewith, notwithstanding thefact that the axis about which they rotate is not concentric with theaxis of the cylindrical chamber in which they operate.

The gas thereby compressed is admitted to the cylindrical bore aroundthe rotor through an Lca elongated intake port 62 (Fig. 6) formed in thewall of the bore intermediate its top and bottom, this port being incommunication through a passage 63 extending through the members 33, 32and the base 26 with the pipe 22 leading from the expander 21. Theadmitted gas is compressed by the rotation of the blades 56 and isdischarged through the outlet ports 64, best lllustrated in Figs. 7 and14. A plurality of these ports is utilized in order to permit rapid andfree delivery of the compressed gas with a. minimum of resistance andafter issuing from these ports the gas is collected in a chamber formedby cap or housing 64a attached by screws 65 or otherwise to the side ofthe housing 33 from whence the gas is delivered through a pipe 66 intothe space around the electric motor, but above the oil` level maintainedin the unit.' Cap 64a provides an expansion chamber or manifold whichserves to muille the noise of the discharged gas.

For the purpose of lubricating the blades, the sealing elements andthewalls of the chamber `with which these sealing elements contact, andfor the further purpose of forming an oil-seal to preclude leakage ofthe gas past the blades, I have provided, as shown in Figs. 6 and 8, forthe admission of oil from the sump into the b ore of the housing. Withthis end in view, a passage 67 is formed through the housing wall 33,the base 32 and the table 29 to establish communication between the oilsump 31 and the bore of the housing through which oil enters the housingfor the purposes indicated. Preferably a small nozzle or tip 68 forminga continuation of the passage 67 is provided, the size of Athe openingthrough which determines the quantity of oil admitted. This quantity maybe regulated by the substitution of tips having different size bores. k

Rotation of the rotor 51 carrying with it the blades contacting thesurrounding walls of the bore serves therefore to draw in gas throughthe passage 63 from the expander and to compress said gas and deliver itthrough discharge pipe 66 into the space within the unit above the oillevel. The oil drawn in through passage 67 which serves to seal theblades and to insure lubrication of the moving parts is discharged withthe compressed gas and drops back into the sump. While the rotor Visemployed in the present instance primarily as a compressor, it will beobvious that it may be used primarily as a vacuum pump without deviatingin any respect from the principles of the apparatus.

The gas delivered under pressure by the ro'- 'tor rises around the motorand is retained under pressure. The case 16 which has a sealedconnection with the base 26 and in conjunction with the base forms anhermetically sealed inclosure for all of the operating parts of theunit.v The gas collected within the case in the upper portion of theunit is delivered under pressure through the pipe 18 to the condenser 17in the i usual manner.

My improved rotor is designed `not only' to serve as a suction pump anda compressor, but

also as an oil pump, and with this end in view, the reciprocation of theblades 57 in their slots is utilized to induct and eject .oil into andfrom these slots at eachrevolution of the rotor.

The oil in the sump of the' unit is vof course subjected to the pressureof the compressed gas above the oil in the case 16 and this pressurecauses the oil tonow from the sump through a passage 69 in the wall ofthe sump to the pipe 24 through which itis delivered to the coolingelement 23 and thence through pipe 25 back to passage 71 communicatingwith the central'well 28. This well,as will be apparent from Figs. 7 and8a, is periodically in communication with the blade slots 56 as therotor revolves, the communication being established through verticalports 72 which admit oil from the well to the space at the inner end ofeach blade 57 as this space, during the rotation of the rotor, passesthe porta 72. For illustrative purposes three of these ports 72 areshown, each communicating at its upper end with an elongated groove 73(Fig.A 4) providing an elongated suction or intake port with which eachblade slot establishes communication for a suflicient length of time topermit the space back of each blade to` be illled with oil. The

admission of oil 'at the inner sides of the blades serves the dualpurpose of lubricating the blades and of forcing the blades outwardlyagainst the surrounding walls of the housing bore, because, it will berecalled, the oil is admitted to these blade slots under the pressureexisting within the case of the unit.

`To preclude hammering of the blades resulting from forcing the bladesinwardly 'against the relatively non-compressible oil when the intakeport has been cut oil", I provide for admitting with the oil a limitedquantity of gas which, being mixed with the oil and relativelycompressible, obviates undue strain upon the blades-and insures smoothand even operation of the blades.

` The gas is admitted to one of the ports 72 through a passage 74 formedin the housing base 32, the outer end of the passage being connectedwith a breather pipe 75 extending upwardly between the periphery of theelectric motor and the surrounding casing 68 to a point near the top ofthis case. The gas delivered through passage 7,4 into port 72 is admixedwith the oil and enters the pump therewith for the purposes aboveindicated.

Upon further rotation of the rotor, the blade slots are successivelybrought into communication with an elongated arcuate discharge port 76,which, through radial channels 77 communicates with a central bore orpassage 78 extending upwardly through the rotor and into the shaft 49,as Will be apparent from Figs. 7 and 10. Radial passages 81 from thisbore communicate at their outer ends with an annular groove 82 formed onthe interior of the standard 36, and a spiral groove 83 in the exteriorof the shaft 49 communicates at its lower end with the groove 82 and atits upper end with asimilar groove 84 which in turn communicates throughradial passages 85 with a bore 86 in the upper end of shaft 49.

The standard 36 is provided also with a radial passage r87 communicatingat its inner end with the groove 82 and at its outer end with a spiralgroove v88 formed in the perimeter of the standard and communicating atits upper end through a radial passage 89 with the groove 84. It will beapparent therefore thatthe oil delivered bythe oil pump consisting ofthe reciprocating blades of the rotor iiows from exhaust ports 76through channels 77 into bore 78, thence outwardly through passages 81into groove 82 from whence part of the oil is carried upwardly by thegroove 83 in the shaft to lubricate the shaft journal and part of itflows through passage 87 into groove 88 and is, carried upwardly in thisgroove by the surrounding rotating motor sleeve 47 to lubricate themotor Journal, whereupon the oil delivered by both grooves 83 and 88 isdischarged at the upper end of the shaft through bore 86.

The upper end of shaft 49 is threaded to receive a cap nut 91 providedwith radial distributing ports 92 through which the oil is deliveredlaterally from the shaft. This nut serves also to clamp in position aconically shaped oil distributor 93 which is carried by and rotates withthe shaft so that the oil delivered through ports 92 into thedistributor is thrown by centrifugal force upwardly and` outwardly sovas to be distributed over the electric motor.

To insure against all the oil flowing downwardly along the inner facesof the case 68 instead of downwardly over the motor windings as isdesired, a shield 94 is employed which is carried and held in positionby the fastening rods 46 of the stator, suitable spacing washers beinginterposed between the stator discs and the shield as will be apparentfrom Fig. 1.

` Operation After the parts above described have been assembled andasuitable quantity of light oil has been introduced into the unit andthe unit has been charged with a refrigerating medium, such as sulphurdioxide under the customary pressure, my invention operates in thefollowing manner. Current is turned on to the stator of the electricmotor in the usual manner, the motor leads being indicated on Fig. 2 ofthe drawing by reference characters 96, 97, and 98, the motor rotorcarried by the sleeve 47 journaled upon the `standard 36 revolves andthrough the flexible connection 53 directly drives the pump shaft 49without transmission of either weight or lateral thrusts to the shaft.This shaft, journaled upon the interior of the standard 36, revolves thepump rotor 51 formed integrally therewith and disposed eccentricallywithin the bore 34 of the housing. The revolving blades 57 drawrefrigerant from the expander through the elongated intake port 62 intothe housing where it is compressed and delivered through pipe' 66 intothe unit case above the oil level. The oil which is drawn into thehousing through the passage 67 from the sump to lubricate and seal thepump blades is discharged with the compressed gas through pipe 66 andfallsbacl: into the sump. The gas rises inthe case from whence it isdischarged under pressure through pipe 18 into the condenser.

Oil in the sump under the pressure of the gaseous refrigerant in thecase flows through pipe 24 into the cooling element 23 where it iscooled and thence through pipe 25 back into the central oil well fromwhich, together with a limited quantity of gas admitted through breatherpipe 75, it is delivered into the inner ends of the blade slots of therotor as these slots pass the elongated intake port 73. blades inducedby the eccentric relation between the rotor and surrounding housingforces the oil with its entrained gas from .the blade pockets throughthe elongated discharge port 76, thence upwardly through passage v78from which it is carried upwardly by the spiral grooves 83 and 88 tolubricate the journal bearings for the pump shaft and the sleeve of theelectric rotor whereupon the oil is discharged at the top of the shaftinto the distributor 73 by which it is distributed over' the motor andflows downwardly over and around the,-motor to the sump from which it isrecirculated through the cooling element. The heat generated by themotor and part ofthe heat generated by the compressor is absorbed by theThe inward movement of thecirculating oil and the absorbedl heat unitsare carried to the cooling element where they are dissipated toatmosphere. The unit therefore may be located in any desired positionand even imbedded in heat insulating material if desired, because thecooling of the unit is not dependent upon circulation of either acooling fiuid or air around the unit, but the parts are effectivelycooled and the excess heat units removed and dissipated through thecooling-element which is located remote from the unit itself and may beeither water cooled or air cooled, as desired, although I have foundthat at ordinary atmospheric temperatures air cooling is adequate. Bycooling the lubricating oil only and not the seal oil which enters thecompressor chamber, the compressor is not cooled down below the desiredtemperature and accordingly the absorption of refrigerating gas ismaintained at a minimum.

While I have shown and described a preferred embodiment of my invention,obviously the structural details illustrated may be varied withinconsiderable limits without departing from the essence of the inventionas defined in the following claims.

I claim:

1. A refrigerating apparatus comprising a closed casing adapted tocontain a refrigerant under pressure and providing an oil sump, ahousing within said casing providing a refrigerant compressor rotorchamber, a compressor rotor disposed Within said chamber and providedwith lateral blade receiving slots, a blade reciprocable in each of saidslots, an electric motor disposed within said casing and connected torotate said rotor, means for admitting refrigerant gas togetherwith arestricted amount of oil into the chamber around the rotor, means foradmitting oil together with a restricted amount of gas from the upperportion of said casing into said slots at the inner sides of saidblades, said rotor being arranged to discharge refrigerant underpressure into said casing, a refrigerant circulating system connected tosaid casing and the suction side of said compressor, and means fordelivering oil from said compressor into heat absorbing contact withsaid motor to enable absorption by said oil of heat units generated bysaid motor.

2. In a hermetically sealed refrigerating system containing lubricatingoil and a refrigerant absorbable at low temperature in said oil, thecombination of a compressor, an electric motor and a sealed caseenclosing said motor and compressor and into which the compressedrefrigerant is delivered by the compressor, the lower portion of thecase providing a sump for the collection of said lubricating oil, andmeans for causing absorption by said oil of heat from said motor tomaintain an oil temperature unfavorable to refrigerant absorption, saidmeans including an oil pump and suitable conduits whereby oil isdelivered into heat absorbing contact with said motor so as to be heatedthereby.

3. In a hermetically sealed refrigerating. system having a lubricant anda refrigerant absorbable at low temperatures in said lubricant confinedtherein, the combination of a compressor, an electric motor for drivingthe same, a sealed 'case enclosing said motor and compressor, s

refrigerant circulatory system connected at one lishing a lubricanttemperature in the case unfavorable to the absorption of refrigerant bythe lubricant, including means forncirculating the lubricant over and inheat absorbing contact with said motor whereby heat units generated bythe motor are caused to be transferred to the lubricant.

4. A refrigerating apparatus comprising a hermetically sealed casecontaining refrigerant under pressure and a lubricant susceptible at lowtemperatures to absorption of substantial quantities of saidrefrigerant, an electric motor and a compressor mounted in axialalignment in said case and operatively connected togethenlthe4compressor being arranged to discharge into said case around the motorwhereby pressure is created in the case, va refrigerant circuitincluding a condenser and an evaporator, connected at one end to saidcase and at the other to the suctionw side of said compressor, throughwhich said refrigerant is circulated, means for circulating saidlubricant over and in heat absorbing contact with said motor to effect asuilicient transfer of heat units from the motor to the lubricant topreclude overheating of the motor and maintain the lubricant above thetemperatures at which refrigerant is readily absorbed thereby, saidcirculating means includinga passage for delivering the lubricant fromthe compressor above the level of the motor to enable gravity ow of saidlubricant in contact with said motor parts, and means through which saidlubricant from the motor 1 may be circulated to dissipate the excessheat units removed from the motor.

5. A refrigerating apparatus comprising a hermetically sealed casecontaining refrigerant under pressure and a lubricant susceptible at lowtemperatures to absorption of substantial quantities of saidrefrigerant, an electric motor and a compressor mounted in axialalignment in said case and operatively connected together, thecompressor being arranged to discharge into said case around the motorwhereby pressure is cre' ated in the case, a refrigerant circuitincluding a condenser and an evaporator, connected at one end to saidcase and at the other to the suction' side of said compressor, throughwhich said refrigerant is circulated, means for circulating saidlubricant over and in heat absorbing contact with said motor to effect asufficient transfer of heat units from the motor to the lubricant topreclude overheating of the motor and maintain the lubricant above thetemperaturesv at which refrigerant is readily absorbed thereby, saidcirculating means including ya passage for conducting the lubricant fromthe compressor, means for distributing said lubricant over the motor toenable. gravity flow of said lubricant in contact with said motor parts,and means through which said lubricant from the motor may be circulatedto dissipate the excess heat units removed from the motor. f

6. An apparatus comprising a standard, a sleeve journaled on saidstandard, a rotor of an electric motor carried by said sleeve, a rotary`pump including a shaft journaled within said standard, portions ofsaidshaft being hollow, grooves interiorly and exteriorly of said standardcommunicating with the -hollow portions of said shaft, a flexibledriving connection between said shaft and said lsleeve at one end ofsaid standard, and means carried by the upper end of said shaft forcentrifugally distributing oil delivered from said shaft over saidmotor.v

7. An apparatus comprising a base providing an oil sump, a pump housingmounted on said base, a hollow standard rising from said housing,

a pump shaft journaled in said standard, an elec* l tric motorsurrounding said standard and having the rotor thereof journaled on saidstandard but supported by said housing, a vpositive flexible drivingconnection between said rotor and said shaft, an oil distributor at theupper end of said shaftfor distributing oil over said motor anddirecting the same into heat absorbing contact with the windingsthereof, and-means for con-` ducting oil from the pump to the journalbearings of said rotor and pump shaft and to said distributor.

8. An apparatus comprising a housing providing a cylindrical rotorchamber, a rotor therein provided with radially disposed slots, bladesdisposed in said slots, an elongated arcuate intake port communicatingwith said chamber, a plurality ofA outlet ports communicating with saidchamber, an intake port in the base of said housing through which oil isadmitted to said slots at the inner sides of said, blades, a breatherpipe connected with said last mentioned port through which gas may beintroduced with said oil, an exhaust port in the base of said housing,and means for delivering oil through said exhaust port to the bearingsfor said rotor.

9. An apparatus comprising. a hermetically sealed case adapted tocontain liquid and gas, a housing Within said case provided with a bore,a rotor'disposed within said bore and provided with radially disposedblade slots, a, bladereciprocable in each of said slots, a motor forrotating said rotor, intake and discharge ports through the housingcommunicating with the housing space sura restricted amount of liquidfrom saidy case to lsaid intake port, means for delivering liquid and alimited amount of gas from said case to the interior of said rotor. atthe inner ends of said blades, means for delivering said last mentionedliquid and gas to-a point above said motor, and means for separating theliquid from the gas and distributing the liquid over said motor.

1G. An apparatus comprisinga standard, a rotorof an electric motorsurrounding and journaled on said standard, a rotary pump including ashaft journalediwithin said standard, the upper and lower portions ofsaid shaft being hollow, spiral grooves interiorly and exteriorly ofsaid standard surrounding said shaft and said standard respectively andcommunicating at their ends with the hollow portions of said shaft, aflexible driving connection between said shaft and said rotor, meanscarried by the upper end of said shaft for centrifugally distributingoil delivered from thehollow upper portion of said shaft over saidmotor, and means for directing said oil into contact with the motorstator. l

1l. AnV `apparatus comprising a closed case adapted to contain oil, astandard within said case, a rotor of an electric motor journaled uponsaid standard, 'a rotary pump having its shaft journaled within saidstandard, a cooling coil connected to receive oil from said case, aconnection from said coil to the intake side of said pump, meansfor-delivering oil from said pump to the interior and exterior surfacesof said standard. and thence to the end of said shaft, and means fordistributing said delivered oil over the motor into heat absorbingcontact with the stator thereof. f

12. An apparatus ycomprising a base providing an oil sump, a pumphousing carried by said base, a rotary pump lmember within said housing,a pump shaft projecting from said housing, a 150 standard rising fromsaid housing within which said shaft is journaled, an electric motorhaving its rotor surrounding and journaled on said standard, a directflexible driving connection between said rotor and shaft, an oildistributor carried by the upper end of said shaft, means for deliveringoil through the motor pumpbearings to said distributor, means fordirecting the distributed oil into heat absorbing contact with themotor, and means for cooling the heated oil.

13. An apparatus comprising a base providing an oil sump, a pump housingcarried by said base, a rotary pump member Within said housing, a

Vpump shaft projecting from said housing, an electric motor having itsrotor surrounding and disposed coaxially with said shaft, a directdriving connection between said rotor and shaft, an oil distributorcarried by the upper end of said shaft, means for delivering oil fromsaid pump to said distributor whereby the same is distributed over saidmotor, a shield disposed in proximity to said distributor for directingthe distributed oil into contact with the motor stator, a caseassociated with said base to provide-a sealed enclosure within whichsaid pump, motor, distributor, and shield are disposed, and means fordissipating heat removed oy said oil from the motor.

i4. en apparatus comprising a compressor housing providing a rotorchamber, a rotor therein provided with slots each having radiallyreciprocable blades disposed therein, means for supplying fiuid to becompressed to said charnber, means for supplying a restricted quantityof lubricant to said chamber, an exhaust port through which thelubricant and compressed duid are discharged from said chamber,lubricant supply and exhaust ports communicating alternately uponrotation of the rotor with the inner portions of said slots, an electricmotor connected to rotate said rotor, means for conducting lubricantfrom said lubricant exhaust port through the motor bearings, and meansfor directing lubricant vinto contact with said motor.

l5. An apparatus comprising a base providing an oil sump, a pump housingmounted on said base, a holiovv standard rising from said housing, apump shaft iournaled in said standard,

- an electric motor surrounding said standard and "iii havingthe rotorthereof journaled on said standard but supported by said housing, apositive driving connection between said rotor and said sl1 t, an oildistributor at the upper end of said shaft for distributing oil oversaid motor and directing the same into heat absorbing contact with thewindings thereof, and means for conducting oil from the pump to thejournal bearings of said rotor` and pump shaft and to said distributor.

id. An apparatus comprising a case providing an oil sum a housing withinsaid case, oil pumping and refrigerant compressing mechanism within saidhousing, an operating shaft projecting from said housing, an electricmotor having its rotor surrounding said shaft, a flexible drivingconnection between said rotor and shaft, means for cooling the motor byinducing a grav- -ity fiow of oil in contact therewith to abstract heatunits therefrom, said motor cooling means .including an oil distributorfor distributing oil memes above the motor, means for continuouslydelivering oil from said pump to said distributor during the operationof the motor, a deflecting surface arranged to direct the oil from thedistributor into heat absorbing contact with the motor, and means forcooling the oil.

17. An apparatus comprising a closed case adapted to contain oil and arefrigerant, a shaft bearing within said case, a pump and compressor, adriving shaft therefor journalled in said bearing, an electric motorwithin said-case having the rotor thereof connected to said shaft todrive the same, means for removing heat from the motor including meansfor continuously conducting oil delivered by said pump in quantitiessufficient to absorb excessive heat units `from the motor to a levelwithin the case above the motor and means for distributing and directingsaid oil into heat absorbing contact with external portions of themotor, and means for cooling said oil. i

18. An apparatus comprising a hermetically sealed case adapted tocontain lubricant and refrigerant, an operating unit mounted in saidcase, said unit including a. refrigerant compressor, a lubricant pumpand an electric motor connected to drive such compressor and pump, motorcooling means including means for deliverlng above the motorcontinuously during the operation of the pump, lubricant discharged by10S said pump in' suiiicient quantities to cool said motor, meansoperated by said motor for distributing said delivered lubricantioversaid motor, means on the interior of said case for directing thedistributed lubricant into heat absorbng contact with external portionsof said motor and means exteriorly of said case for cooling saidlubricant.

19. In a refrigerating machine, the combination of a motor including arotor and a stator, a post on which the rotor is journalled, acompressor having a shaft journalled within said post, means forsupplying oil to said compressor, means for conducting the oil from saidcompresser to the upper end of said shaft, means carried by said shaftfor centrifugally distributing said oil over said motor, means fordirecting said distributed oil into direct heat absorbing contact withexposed surfaces of said motor for cooling the motor and means forabstracting from said oil heat units absorbed thereby from the motor.

20. An apparatus comprising a housing p roviding a cylindrical rotorchamber, a rotor therein provided with radially disposed slots and anaxial bore extending through the rotor, blades reciprocable in saidslots, an intake port through which the fluid to be compressed isintroduced into said chamber, an outlet port through which uid isdischarged from the chamber, the base of said housing being providedwith an arcuate intake port through which oil is admitted to said slotsat the inner ends of said blades, and with an arcuate exhaust portthrough which said oil is discharged by said blades, and with a radiallydisposed channel connecting said exhaust port with said axial borewhereby the oil dis- 'charged by said blades is conducted through theside thereof.

